Dumping-body hoist



June 4, 1929. R BARRETT 1,715,491

DUMPING BODY HOIST Filed May 25, 1925 4 Sheets-Sheet 1 x TnuamYor E 2 Edward R.BQY\(C.

June 4, 1929. R BARRETT 1,715,491

DUMPING BODY HOIST Filed May 25, 1925 4 Sheets-Sheet 2 e 1929. E. R. BARRETT DUMPING BODY HOIST Filed May 25, 1925 4 Sheets-Sheet 5 Inuunfov EdworRBorvarf TESL flfiorne June 4, 1929. -fi 1,715,491

DUMPING BODY HOIST Filed May 25, 1925 4 Sheets-Sheet 4 Invenfov EdwuvRBurvefi.

Patented June 4, 1929.

EDWARD R. BARRETT, 0F DETROIT, MICHIGAN, ASSIGNOR ,TO WOOD HYDRAULIC HOIST & BODY COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN DUMPING-BODY Horsr.

Application filed may 25, 1925. Serial No. 32,569.

This invention relates to a hoisting mechanism to be used in connection with tiltably mounted bodies such as may be supplied to motor trucks used in hauling and dumping heavy material or the like. It is common practice to tiltably mount a body of this character at its under side and adjacent its rear end to the rear end of the truckor other vehicle frame, and to use hydraulic meansto tilt or elevate the front end of the body. One form of 'such hoisting mechanism -is disclosed in the United States Patent No. 1,502,534 to Logan T. Wood; the present invention is concerned. with various improvements in construction for the attainment of many advantages over hoisting constructions of the type shown in said Wood patent.

One of the primary features of the present invention is that the hoist mechanism applied to the truck is greatly reduced in weight through the elimination of many parts heretofore considered necessary yet with no sac rifice of strength or durability in the construction. A further purpose and object of the invention resides in the provision of cam members linked to the frame of the chassis of the vehicle to make toggle lever constructions which serve particularly toptoduce a more advantageous lift or tilting of the body without running up extremely high pressures in the hydraulic hoisting apparatus, the

straightening out of the toggle constructions occurring at the end of the tilting operation, this completing the body tilting and securing the requisite force to accomplish-such tilting without great increase in hydraulic pressure which would otherwise be necessary. A still further object in the invention resides in the provision of a novel construction of cross head or trundle used in connection with the V apparatus and one having a greater spread that permits direct attachment of the socalled cam members to the longitudinal sills of the body and the direct application of all forces set up during the operation of tilting the body to these longitudinal sills, eliminating bending strains and, in many cases, breakage of auxiliary members which have hereto fore been used in attaching the cams to the body. And a still further object of the invention, and one of great practical importance, is to produce a hoisting mechanism of the character described which is much more easy and simple to install, requiring no particular and special work for the installation of the hoist on a truck.

For the attainment of these objects and purposes as well as various others which will be apparent as understanding of the invention is had, I have produced the construction described in the following description and illustrated in the accompanying drawings, in which,

Fig. 1 is a side elevation of a truck equipped with a tilting body and having myhoisting mechanism applied thereto.

Fig. 2 is a fragmentary longitudinal section through the body and the rear portion of the truck showing the body in partially tilted position.

Fig. 3 is a somewhat enlarged plan view of the rear portion of the chassis frame and the hoisting mechanism mounted thereon, the body being removed from the sills thereof and with parts broken away to better illustrate the construction.

Fig. 4 is a longitudinal vertical section 1showing the body in lower horizontal posi- Fig. 5 is a vertical transverse section through the mechanism directly in front of the trundle, and

Fig. 6 is a view similar to Fig. 2 showing the body in extremetilted position.

Like reference characters refer to like parts in the different figures of the drawings.

The truck or other motor vehicle on which the invention is designed to be installed may be of any preferred construction, including spaced apart substantially parallel chassis framemembers 1. On these frame members tracks 2 are permanently secured, the same 4 preferably being of metal and inclined downwardly slightly from their rear toward their front ends. The body is hingedly connected "to the rear end of the chassis frame, hinge members 3 being permanently secured-one to each of the chassis frame members'l and at the rear ends thereof, hingedly connected to which are two body hinge members 4 which are permanently secured to the under sides tudinal sills 5 and fixed thereto, secured to which is the body 7 formed of sheet metal and havin an open rear end normally closed when the ody is in horizontal position by a 1 1y connected to the body by means of across rod 15 which extends between and passes through bearing blocks 16 fixed to the longitudinal sills 5 at points between the ends of said sills or, in practice, slightly forward of the middle points of the sills as shown. Collars 17 secured to the rod 11 at the inner sides of the links 12 serve to locate said links and hold them against movement lengthwise of the rod 11, and in practice a collar 18 may be disposed'between each bearing block 16 and the cam member 14on the rod 15, though this is not essential. It is apparent that the cam members 14 and the links 12 provide toggle constructions, the knuckles of which are at the pivots 13.

' A cylinder'19 is mounted on the cross members 20 and 21 disposed between and-secured to the chassis frame members 1. The cylinder is slightly elevated at its rear end by means of a plate 22 connected to the cross member and supporting therear end of the cylinder. A piston (not shown) located within the cylinder has a piston rod 23 connected thereto which extends outwardly at the rear end of the cylinder and has attachment to tracks 2. This trundle comprises a cross head a trundle which is designed to traverse the 24, each end of which is formed with a cylindrical projection 25 on whichrollers 26 are loosely mounted, the rollers being flanged and tions 25 of the cross head passing through the plates adjacent their upper corners. This makes a carriage or trundle adapted to move back and forth on the tracks 2 and as the same moves backward thereon the rollers 26 engaging under the cam members 14 serve to tilt the body from its horizontal position shown in Fig. 4 to and through the position shown in Fig. 2 and thence to the extreme position shown in Fig. 6.

It is evident that the construction described is of the simplest form and that its installation is simple and easy. For instance, when a body with the type of hoist-described is to be'installed in the field the body is shipped from the factory with the bearing blocks 16 secured to the longitudinal sills 5' and with the body hinge members 4 secured in place. The trundle, cylinder, piston and piston rod, the toggles comprised of the cam members 14 and links 12, and the truck chassis hinge members 3 with their forwardly extending bracket supports 10, are shipped and it is necessary merely for the one installing the mechanism to attach the hinge members 3 in place.

then bolt or otherwise permanently secure the tracks 2 to the frame members 1, place the trundle thereon, run the rods 11 and 15 through the ends of the cam members 14 and the links 12 and locate and secure the cylinder 19 in place, connecting the parts together and the installation is complete. No'auxiliary tracks between the chassis frame members are required and no supporting members for such tracks extending across the chassis frame are needed. This eliminates in the usual job, at least two hundred pounds in weight and also obviates the necessity of drilling a large number of holes in the chassis frame for the attachment of the various cross members. The cam members 14 being directly connected to the longitudinal sills 5, all of the strains of lifting are carried by said sills which are exceptionally strong and capable of withstanding such strains.

In the operation of the construction, as the trundle moves rearwardly the front ends of the cam members 14 are tilted upwardly and the body is lifted. The toggle lever constructions made by said members 14 and the links 12 gradually straighten out withthe progress of the tilting of the body and when the trundle is approaching its rearmost position, as shown Fig. 2, further rearward movement of the trundle results in a complete straightening out of the toggle lever constructions with the powerful thrust to the body that may be obtained from operation of toggle levers, tilting it without the development of the high pressures which would be present if the cam members 14 were rigidly attached to the body. That is, as the trundle approaches nearer to the pivotal axis about which the body turns, if there is no means of compensating the loss in leverage the pressure required behind the piston serving to move the trundle is greatly increased due to the shortening of the leverage in conjunction with which 'the power operates." But with this construction while there is a lifting of the body by reason of the action of the trundle rollers against the under side of the'cam there is also a change in 7 of the vehicle, the body at times would be liable to tilt toofar to the rear.

position .of the cam members so that the power has a greater distance through which to work to accomplish a given tiltingof the body. This being so the power may be reduced, for the work done being constant the force required may be reduced if it can be made to operate through a greater distance. This is a feature of value in connection with devices of this character wherein theload tilted is very heavy, and is many times increased over and beyond what the mechanism is designed to take care of with a resultant breaking or straining of parts of the mechanismdue to the exceedingly high pressures required. With the reduction of these pressures and an accomplishment of the same re sults greater durability for the mechanism it attained-and breakage andundue strain of the mechanismobviatedto a great extent if not entirely. I

The toggle lever constructions when straightened outtothe positions shown in Fig.6, that is with the body tilted to'its extreme upperposition, also serve tohold the body from over tilting, making as they do a connection between the body and the frame of the vehicle which allows upward tilting of the body only to a redetermined extreme position. Without t is insurance against over tilting when theload was being dumped and particularly when the rear end of the motor vehicle is'located on ground having a downward incline from the front to the rear 7 The knuckle of the toggle lever, constructions of course does not want to pass beyond the dead center lines of such constructions and "the stopping of the movement of the-trundle insures against this while anyattempted over tilting of the body merely draws the pivots of the toggle lever constructions into a straight line beyond which the body cannot further tilt. These features of advantage from the standpoint of weight required, elimination of parts, lessening of expense and increasing the life of the mechanism combine to make] the invention one of great value. It is apparent that many changes in minor details of construction may-be resorted to without de-l fpartlng' from the invention. For instance the bearing blocks 16, so long as they are secured to the longitudinal sills 5,- need not be secured at ,anyparticular point. on said sills and-while they-are shown as located above the sills may be fitted into the inner channel members of said sills quite as well. changes in details of construction are mat- These various ters of design and are not of the essence of the invention. The invention is defined in the appended claims and is to be considered as comprehensive of all forms ofstructure coming within their scope.

Iclaim:

1. In combination with a motor vehicle having a chassis frame including side frame members, tracks fastened to the upper side of said members, a trundle comprislng two spaced apart lower rods, a roller mounted at each end of each rod bearing against said tracks, spaced apart plates through which the rods pass, a cross head extending through the plates at their upper portions, a roller mounted at each end of the cross head, aibody tiltably mounted on the chassis frame adapted to be elevated at its frontend, links plvotally mounted on the chassis frame at their rear ends, and a cam member pivotally connected at one end "to the front end; of each of said links and extending forwardly therefrom, said cam members being pivotally connected at their front ends to the body,

said trundle being located under said cam I members and the last mentioned rollers 0fthe trundle bearing against the under edges of the cam members and movable to tilt said body.

.2. In a constr uction of the classdescribed,

'a' motor vehicle including spaced apart.

chassis frame members, a hinge member located at the rearend and at the upper side. of each frame member and permanently se-- cured thereto, each of said hinge members having a forwardly extending projection, a

bearing blocks and passing through the front ends ofsaid cam members, other hinge mem- 3 bers connected to the longitudinal sills adjacent their rear ends and pivotally connected to the first mentioned hinge members, and a trundle mounted to traverse back and forth" on the chassis frame members having rollers members to tilt said body.-1.

In testimony whereof-I aflix my signature.

' EDWARD R. BARRETT engaging against theunder sides of the cam 

